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Richard D. Sandberg
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Proceedings Papers

Effects of Localized Non-Gaussian Roughness on High Pressure Turbine Aero-Thermal Performance: Convective Heat Transfer, Skin-Friction and the Reynolds’ Analogy

Thomas O. Jelly, Massimiliano Nardini, Richard D. Sandberg, Paul Vitt, Greg Sluyter
Proc. ASME. GT2024, Volume 13: Heat Transfer: General Interest / Additive Manufacturing Impacts on Heat Transfer; Wind Energy, V013T13A005, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-121839
https://doi.org/10.1115/GT2024-121839
View Paper titled, Effects of Localized Non-Gaussian Roughness on High Pressure Turbine Aero-Thermal Performance: Convective Heat Transfer, Skin-Friction and the Reynolds’ Analogy
Open the PDF for Effects of Localized Non-Gaussian Roughness on High Pressure Turbine Aero-Thermal Performance: Convective Heat Transfer, Skin-Friction and the Reynolds’ Analogy in another window
Topics: Convection, Heat transfer, High pressure (Physics), Skin friction (Fluid dynamics), Surface roughness, Turbines
Proceedings Papers

Improving a Two-Equation Eddy-Viscosity Turbulence Model for High-Rayleigh-Number Natural-Convection Flows Using Machine Learning

Ali Haghiri, Xiaowei Xu, Richard D. Sandberg, Koichi Tanimoto, Takuo Oda
Proc. ASME. GT2024, Volume 13: Heat Transfer: General Interest / Additive Manufacturing Impacts on Heat Transfer; Wind Energy, V013T13A003, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-121161
https://doi.org/10.1115/GT2024-121161
View Paper titled, Improving a Two-Equation Eddy-Viscosity Turbulence Model for High-Rayleigh-Number Natural-Convection Flows Using Machine Learning
Open the PDF for Improving a Two-Equation Eddy-Viscosity Turbulence Model for High-Rayleigh-Number Natural-Convection Flows Using Machine Learning in another window
Topics: Eddies (Fluid dynamics), Flow (Dynamics), Machine learning, Modeling, Natural convection, Turbulence, Viscosity
Proceedings Papers

Optimal Riblets Applied to Gas Turbine Compressor Blades Studied via Direct Numerical Simulation

Melissa Kozul, Massimiliano Nardini, Pawel J. Przytarski, William Solomon, Aamir Shabbir, Richard D. Sandberg
Proc. ASME. GT2024, Volume 12A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V12AT29A007, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-122305
https://doi.org/10.1115/GT2024-122305
View Paper titled, Optimal Riblets Applied to Gas Turbine Compressor Blades Studied via Direct Numerical Simulation
Open the PDF for Optimal Riblets Applied to Gas Turbine Compressor Blades Studied via Direct Numerical Simulation in another window
Topics: Blades, Compressors, Computer simulation, Gas turbines
Proceedings Papers

Performance of Rough-Ribbed Low-Pressure Turbine Blades Under Varying Loading and Operating Conditions

Ananth S. M., Massimiliano Nardini, Melissa Kozul, Nagabhushana Rao Vadlamani, Richard D. Sandberg
Proc. ASME. GT2024, Volume 12B: Turbomachinery — Axial Flow Turbine Aerodynamics; Deposition, Erosion, Fouling, and Icing, V12BT30A039, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-127998
https://doi.org/10.1115/GT2024-127998
View Paper titled, Performance of Rough-Ribbed Low-Pressure Turbine Blades Under Varying Loading and Operating Conditions
Open the PDF for Performance of Rough-Ribbed Low-Pressure Turbine Blades Under Varying Loading and Operating Conditions in another window
Topics: Pressure, Surface roughness, Turbine blades, Design, Skin friction (Fluid dynamics), Blades, Boundary layers, Flow (Dynamics), Turbulence, Bubbles
Proceedings Papers

DNS of Turbine Vanes Subjected to Inlet Temperature Variations and Robust Quantification of Aerothermal Flow Irreversibilities

Massimiliano Nardini, Melissa Kozul, Richard D. Sandberg
Proc. ASME. GT2024, Volume 12C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V12CT32A030, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-126865
https://doi.org/10.1115/GT2024-126865
View Paper titled, DNS of Turbine Vanes Subjected to Inlet Temperature Variations and Robust Quantification of Aerothermal Flow Irreversibilities
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Topics: Computer simulation, Entropy, Flow (Dynamics), High pressure (Physics), Temperature, Turbines, Turbulence
Proceedings Papers

Exploiting a Transformer Architecture for Simultaneous Development of Transition and Turbulence Models for Turbine Flow Predictions

Yuan Fang, Maximilian Reissmann, Roberto Pacciani, Yaomin Zhao, Andrew S. H. Ooi, Michele Marconcini, Harshal D. Akolekar, Richard D. Sandberg
Proc. ASME. GT2024, Volume 12C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V12CT32A023, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-125550
https://doi.org/10.1115/GT2024-125550
View Paper titled, Exploiting a Transformer Architecture for Simultaneous Development of Transition and Turbulence Models for Turbine Flow Predictions
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Topics: Flow (Dynamics), Turbines, Turbulence, Computational fluid dynamics, Errors, Reynolds-averaged Navier–Stokes equations, Computer programming, Machine learning, Natural language processing, Physics
Proceedings Papers

Unsteady Loss Mechanisms in Low-Pressure Turbines With Diverging End-Walls Studied via High-Fidelity Simulation

Marco Rosenzweig, Melissa Kozul, Richard D. Sandberg
Proc. ASME. GT2024, Volume 12D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Radial Turbomachinery Aerodynamics; Unsteady Flows in Turbomachinery, V12DT36A010, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-125408
https://doi.org/10.1115/GT2024-125408
View Paper titled, Unsteady Loss Mechanisms in Low-Pressure Turbines With Diverging End-Walls Studied via High-Fidelity Simulation
Open the PDF for Unsteady Loss Mechanisms in Low-Pressure Turbines With Diverging End-Walls Studied via High-Fidelity Simulation in another window
Topics: Pressure, Simulation, Turbines, Wakes, Blades, Flow (Dynamics), Boundary layers, Engines, Cascades (Fluid dynamics), Mach number
Journal Articles

A Data-Driven Approach for Generalizing the Laminar Kinetic Energy Model for Separation and Bypass Transition in Low- and High-Pressure Turbines

Yuan Fang, Yaomin Zhao, Harshal D. Akolekar, Andrew S. H. Ooi, Richard D. Sandberg, Roberto Pacciani, Michele Marconcini
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. September 2024, 146(9): 091005.
Paper No: TURBO-23-1139
https://doi.org/10.1115/1.4065124
Published Online: April 4, 2024
View Article titled, A Data-Driven Approach for Generalizing the Laminar Kinetic Energy Model for Separation and Bypass Transition in Low- and High-Pressure Turbines
Open the PDF for A Data-Driven Approach for Generalizing the Laminar Kinetic Energy Model for Separation and Bypass Transition in Low- and High-Pressure Turbines in another window
Topics: Computational fluid dynamics, Kinetic energy, Pressure, Separation (Technology), Shear stress, Turbines, Turbulence, Wakes, High pressure (Physics), Flow (Dynamics)
Journal Articles

Improvements in the Prediction of Steady and Unsteady Transition and Mixing in Low-Pressure Turbines by Means of Machine-Learnt Closures

Roberto Pacciani, Michele Marconcini, Andrea Arnone, Francesco Bertini, Ennio Spano, Simone Rosa Taddei, Richard D. Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. May 2024, 146(5): 051009.
Paper No: TURBO-23-1186
https://doi.org/10.1115/1.4064312
Published Online: January 16, 2024
View Article titled, Improvements in the Prediction of Steady and Unsteady Transition and Mixing in Low-Pressure Turbines by Means of Machine-Learnt Closures
Open the PDF for Improvements in the Prediction of Steady and Unsteady Transition and Mixing in Low-Pressure Turbines by Means of Machine-Learnt Closures in another window
Topics: Blades, Boundary layers, Cascades (Fluid dynamics), Machinery, Pressure, Reynolds number, Reynolds-averaged Navier–Stokes equations, Turbines, Turbulence, Wakes
Journal Articles

Effects of Riblet Dimensions on the Transitional Boundary Layers Over High-Lift Turbine Blades

S. M. Ananth, Massimiliano Nardini, Aditya Vaid, Melissa Kozul, Nagabhushana Rao Vadlamani, Richard D. Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2024, 146(3): 031012.
Paper No: TURBO-23-1250
https://doi.org/10.1115/1.4064087
Published Online: December 14, 2023
View Article titled, Effects of Riblet Dimensions on the Transitional Boundary Layers Over High-Lift Turbine Blades
Open the PDF for Effects of Riblet Dimensions on the Transitional Boundary Layers Over High-Lift Turbine Blades in another window
Topics: Blades, Boundary layers, Dimensions, Flow (Dynamics), Surface roughness, Turbulence, Turbine blades, Skin friction (Fluid dynamics), Simulation, Pressure gradient
Journal Articles

Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part I: Methodology and Challenges

Massimiliano Nardini, Melissa Kozul, Thomas O. Jelly, Richard D. Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2024, 146(3): 031008.
Paper No: TURBO-23-1172
https://doi.org/10.1115/1.4063753
Published Online: December 4, 2023
View Article titled, Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part I: Methodology and Challenges
Open the PDF for Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part I: Methodology and Challenges in another window
Topics: Blades, Flow (Dynamics), Surface roughness, Turbulence, Computer simulation
Journal Articles

Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part II: The Effect of Roughness on the Performance of a High-Pressure Turbine Blade

Massimiliano Nardini, Thomas O. Jelly, Melissa Kozul, Richard D. Sandberg, Paul Vitt, Greg Sluyter
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2024, 146(3): 031009.
Paper No: TURBO-23-1225
https://doi.org/10.1115/1.4063974
Published Online: December 4, 2023
View Article titled, Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part II: The Effect of Roughness on the Performance of a High-Pressure Turbine Blade
Open the PDF for Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part II: The Effect of Roughness on the Performance of a High-Pressure Turbine Blade in another window
Topics: Blades, Boundary layers, Surface roughness, Turbulence, Computer simulation, Turbine blades, High pressure (Physics), Flow (Dynamics), Heat flux, Wakes
Journal Articles

Direct Numerical Simulation of a High-Pressure Turbine Stage: Unsteady Boundary Layer Transition and the Resulting Flow Structures

Taiyang Wang, Yaomin Zhao, John Leggett, Richard D. Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. December 2023, 145(12): 121009.
Paper No: TURBO-23-1160
https://doi.org/10.1115/1.4063510
Published Online: October 19, 2023
View Article titled, Direct Numerical Simulation of a High-Pressure Turbine Stage: Unsteady Boundary Layer Transition and the Resulting Flow Structures
Open the PDF for Direct Numerical Simulation of a High-Pressure Turbine Stage: Unsteady Boundary Layer Transition and the Resulting Flow Structures in another window
Topics: Boundary layers, Flow (Dynamics), Turbulence, Wakes, Suction, Blades, Rotors, Turbines
Proceedings Papers

A Data-Driven Approach for Generalizing the Laminar Kinetic Energy Model for Separation and Bypass Transition in Low- and High-Pressure Turbines

Yuan Fang, Yaomin Zhao, Harshal D. Akolekar, Andrew S. H. Ooi, Richard D. Sandberg, Roberto Pacciani, Michele Marconcini
Proc. ASME. GT2023, Volume 13C: Turbomachinery — Deposition, Erosion, Fouling, and Icing; Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V13CT32A025, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102902
https://doi.org/10.1115/GT2023-102902
View Paper titled, A Data-Driven Approach for Generalizing the Laminar Kinetic Energy Model for Separation and Bypass Transition in Low- and High-Pressure Turbines
Open the PDF for A Data-Driven Approach for Generalizing the Laminar Kinetic Energy Model for Separation and Bypass Transition in Low- and High-Pressure Turbines in another window
Topics: High pressure (Physics), Kinetic energy, Separation (Technology), Turbines, Computational fluid dynamics, Wakes, Pressure, Turbulence, Acoustics, Blades
Proceedings Papers

High-Fidelity Computational Assessment of Aero-Thermal Performance and the Reynolds’ Analogy for Additively Manufactured Anisotropic Surface Roughness

Thomas O. Jelly, Wagih Abu Rowin, Nicholas Hutchins, Daniel Chung, Koichi Tanimoto, Takuo Oda, Richard D. Sandberg
Proc. ASME. GT2023, Volume 7B: Heat Transfer — General Interest/Additive Manufacturing Impacts on Heat Transfer; Internal Air Systems; Internal Cooling, V07BT13A005, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102138
https://doi.org/10.1115/GT2023-102138
View Paper titled, High-Fidelity Computational Assessment of Aero-Thermal Performance and the Reynolds’ Analogy for Additively Manufactured Anisotropic Surface Roughness
Open the PDF for High-Fidelity Computational Assessment of Aero-Thermal Performance and the Reynolds’ Analogy for Additively Manufactured Anisotropic Surface Roughness in another window
Topics: Additive manufacturing, Anisotropy, Heat transfer, Surface roughness, Turbulence, Flow (Dynamics), Pressure, Channel flow, Computational fluid dynamics, Computer simulation
Proceedings Papers

Improvements in the Prediction of Steady and Unsteady Transition and Mixing in Low Pressure Turbines by Means of Machine-Learnt Closures

Roberto Pacciani, Michele Marconcini, Andrea Arnone, Francesco Bertini, Ennio Spano, Simone Rosa Taddei, Richard D. Sandberg
Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A025, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102985
https://doi.org/10.1115/GT2023-102985
View Paper titled, Improvements in the Prediction of Steady and Unsteady Transition and Mixing in Low Pressure Turbines by Means of Machine-Learnt Closures
Open the PDF for Improvements in the Prediction of Steady and Unsteady Transition and Mixing in Low Pressure Turbines by Means of Machine-Learnt Closures in another window
Topics: Machinery, Pressure, Turbines, Wakes, Turbulence, Cascades (Fluid dynamics), Boundary layers, Inflow, Kinetic energy, Modeling
Proceedings Papers

Direct Numerical Simulation of Riblets Applied to Gas Turbine Compressor Blades at On- and Off-Design Incidences

Melissa Kozul, Massimiliano Nardini, Pawel J. Przytarski, William Solomon, Aamir Shabbir, Richard D. Sandberg
Proc. ASME. GT2023, Volume 13A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V13AT29A006, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101038
https://doi.org/10.1115/GT2023-101038
View Paper titled, Direct Numerical Simulation of Riblets Applied to Gas Turbine Compressor Blades at On- and Off-Design Incidences
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Topics: Blades, Compressors, Computer simulation, Design, Gas turbines
Proceedings Papers

Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness - Part I: Methodology and Challenges

Massimiliano Nardini, Melissa Kozul, Tomas O. Jelly, Richard D. Sandberg
Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A030, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103355
https://doi.org/10.1115/GT2023-103355
View Paper titled, Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness - Part I: Methodology and Challenges
Open the PDF for Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness - Part I: Methodology and Challenges in another window
Topics: Channel flow, Computer simulation, High pressure (Physics), Surface roughness, Turbines, Turbulence
Proceedings Papers

Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness - Part II: The Effect of Roughness on the Performance of a High-Pressure Turbine Blade

Massimiliano Nardini, Thomas O. Jelly, Melissa Kozul, Richard D. Sandberg, Paul Vitt, Greg Sluyter
Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A020, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102671
https://doi.org/10.1115/GT2023-102671
View Paper titled, Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness - Part II: The Effect of Roughness on the Performance of a High-Pressure Turbine Blade
Open the PDF for Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness - Part II: The Effect of Roughness on the Performance of a High-Pressure Turbine Blade in another window
Topics: Computer simulation, High pressure (Physics), Surface roughness, Turbine blades, Turbines, Turbomachinery, Turbulence
Proceedings Papers

Entropy Loss Breakdown Comparison for LES and RANS of a Transonic Compressor Stage Midspan Section

Till Borcherding, Christoph Bode, Marco Rosenzweig, Pawel J. Przytarski, John Leggett, Richard D. Sandberg
Proc. ASME. GT2023, Volume 13A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V13AT29A032, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102949
https://doi.org/10.1115/GT2023-102949
View Paper titled, Entropy Loss Breakdown Comparison for LES and RANS of a Transonic Compressor Stage Midspan Section
Open the PDF for Entropy Loss Breakdown Comparison for LES and RANS of a Transonic Compressor Stage Midspan Section in another window
Topics: Compressors, Entropy, Reynolds-averaged Navier–Stokes equations